Question

❤️ ϙᴜᴇsᴛɪᴏɴ

ᴛʜᴇ 3ʀᴅ ᴀɴᴅ ᴛʜᴇ 9ᴛʜ ᴛᴇʀᴍs ᴏғ ᴀɴ ᴀ.ᴘ. ᴀʀᴇ 4 ᴀɴᴅ − 8 ʀᴇsᴘᴇᴄᴛɪᴠᴇʟʏ, ᴛʜᴇɴ ᴡʜɪᴄʜ ᴛᴇʀᴍ ᴏғ ᴛʜɪs ᴀ.ᴘ ɪs ᴢᴇʀᴏ.​

Answer 1

Answer:

Step-by-step explanation:By the conditions,

a+2d=4..(1)

a+8d=-8..(2)

If we do (2)-(1), we get

8d-2d=-8-4

6d=-12

d=-2

Putting this in (1), we get

a+2(-2)=4

a-4=4

a=8

According to the given,

a+(n-1)d=0

8+(n-1)(-2)=0

-2(n-1)=-8

n-1=4

n=5

Hope this helps you then plz mark me as brainliest

Answer 2

Answer:

5th term!

Step-by-step explanation:

Let :

First term be ' a ' and common difference be ' d :

We have :

t₃ = 4 and t₉ = - 8

We know :

tₙ = a + ( n - 1 ) d

4 = a + 2 d

= > a = 4 - 2 d ... ( i )

= > - 8 = a + 8 d

= > a = - 8 - 8 d ... ( ii )

From ( i )  and  ( ii ) we get :

4 - 2 d = - 8 - 8 d

= > 6 d = - 12

= > d = - 2

Putting d = - 2 in ( i ) we get :

= > a = 4 - 2 d ... ( i )   [ d = - 2 ]

= > a = 4 + 4

= > a = 8

Now we have find which term is zero?

= > 0 = 8 + ( n - 1 ) - 2

= > ( n - 1 ) - 2 = - 8

= > n - 1 = 4

= > n = 5

Therefore , 5th term would be zero!